Rollei 6008 Integral - ASA setting on the back

vanja · November 1, 2007

Hi to all!<br/><br/>

Again some trouble with the Rollei 6008 Integral. Namely, the film back is a

6000 series one and I think it is adapted to work with 6008 camera - so the

camera can read the ASA setting. At some point, the camera did that nicely, but

I had some trouble which "forced" me to poke inside and even thoe I solved the

problem, now the camera want read the ASA seteting.<br/><br/>

I did measure the resistance from the contacts on the back itself and I can see

that the setting on the back does work but I am not sure that the measures are

correct. The below table shows all the measuring, the contact number 1 is at the

far left as shown on the attached image.<br/><br/>

The camera does not respond to ASA setting, but frame forwarding is OK, film

loading also and also the detection of film protection slide not fully

open.<br/><br/>

Unfortunately, I do not have any repair manuals and/or schematics so feel free

to show me the way :-) Any pointers appreciated!<br/><br/>

Thanks!<br/>

Vanja

<tr>

<th width="99" scope="col">Contact 2 & 5</th>

<th width="108" scope="col">Contact 2 & 6</th>

<th width="115" scope="col">Contact 5 & 6</th>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

</table>

tinko_czetwertynksi · November 2, 2007

you might want to check the parts (half circle golden) where those contact on the camera.. i

have a 6008 pro on which the support for those broke (its very fragile, i wouldnt even touch

it) and had to have it repaired. Dont know if that has anything to do with it or not.

vanja · November 2, 2007

By "half circle golden" you mean those half domes on the body itself? I did a check and contacts seam to be in good order.

User_3607948 · November 2, 2007

Vanja,

Only speculation on my part but I could tell you a wonderful story involving digital VOM vs conventional VOM (high vs low input impedance) In summary: micro current devices require impeccable connections.

john_banister1 · November 3, 2007

I took some measurements for comparison. I have

a feeling your back is ok.

Measured with a Fluke model 112 multimeter.

It measured 0.2 - 0.3 ohms when the leads

were touching one another.

120 magazine s/n 501620089

2 & 5 2 & 6 5 & 6

25 2.5 4.77k 4.77k

50 0.60k 4.77k 4.17k

100 1.20k 4.77k 3.57k

200 1.79k 4.77k 2.98k

400 2.38k 4.76k 2.39k

800 2.97k 4.76k 1.79k

1600 3.56k 4.76k 1.20k

3200 4.16k 4.76k 0.60k

6400 4.76k 4.76k 1.9

120 magazine s/n 704520005

2 & 5 2 & 6 5 & 6

25 1.9 6.53k 6.54k

50 0.82k 6.54k 5.73k

100 1.64k 6.54k 4.90k

200 2.46k 6.54k 4.08k

400 3.27k 6.54k 3.26k

800 4.09k 6.54k 2.45k

1600 4.90k 6.54k 1.63k

3200 5.73k 6.54k 0.82k

6400 6.54k 6.54k 1.2

220 magazine s/n 504530004

2 & 5 2 & 6 5 & 6

25 2.1 6.48k 6.48k

50 0.81k 6.48k 5.67k

100 1.62k 6.48k 4.85k

200 2.43k 6.48k 4.05k

400 3.24k 6.48k 3.24k

800 4.05k 6.48k 2.43k

1600 4.85k 6.48k 1.62k

3200 5.67k 6.48k 0.81k

6400 6.48k 6.48k 1.2

pete_kiefer · November 3, 2007

Pins 2&6 on the camera see 6.4 Ohms

Pins 2&5 see ascending values ~doubling

Pins 5&6 see descending valued ~ halving

The ISO (ASA) dial seems to be a simple logarithmic pot with click stops.<div></div>

pete_kiefer · November 3, 2007

What I forgot to say: I think the ISO pot forms a voltage divider. In the cameras processor an input port reads the varing voltage created by applying a constanct voltage to pins 2 & 6 and reading pin 5. The potential difference between 5 (the center pin) and 2/6 is read as a film speed number that is most likely identical to the output of the compensation dial on the body. An Analog to Digital converter outputs a binary number that the processor understands as a film speed value when coming from the film mag and as a compensation factor when coming from the body's dial.

vanja · November 4, 2007

I see your idea about voltage divider and it sounds correct (without the schematics to read it is hard to tell, but it seams reasonable).<br/><br/>

Anyway, I measured from the body, and the 2&6 pins show 595 Ohms which is quite different from you measures. All other pins have no measures at all and pin 6 is grounded on the camera body. t the same time, the compensation dial works fine. Took some voltage measures too and all the pins show activity - I guess that something in the camera itself is not OK. A shame :-)<br/><br/>

I'll probably give it another try, but if you could just check about pin 6 being grounded? Thanks for the input!

vanja · November 4, 2007

John thanks for the back measures, they do show a bit different values but the change rate seams consistent so I agree that the back is probably OK.

User_3607948 · November 5, 2007

Vanja,

Sorry I didn't consider this earlier but your posting about cleaning the shutter speed dial (useful post, thanks!) shows the six connections for the film speed from the back. Have you checked that something simple like a solder joint isn't causing the problem?

vanja · November 6, 2007

Joseph, I resoldered all connections with the back, and in my opinion they are OK. Tried exercising some force to the joint and they seam to hold - the measurements also show that they are correctly connected. I think that I probably short-circuited something non essential and hence the back setting is not visible in the camera. Unfortunately, I don't have another back nor do I have someone who can lend me one for testing, so I'm kind of fishing in the dark... <br/><br/>

Nice idea thoe :-)<br/><br/>

P.S. Thanks for taking the time to read the shutter speed dial cleaning post, I was beginning to doubt it's usefulness :-)

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Rollei 6008 Integral - ASA setting on the back

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